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Pb isotope evidence for contaminant-metal dispersal in an international river system: The lower Danube catchment,Eastern Europe
Authors:Graham Bird  Paul A Brewer  Mark G Macklin  Mariyana Nikolova  Tsvetan Kotsev  Mihail Mollov  Catherine Swain
Institution:1. Centre for Catchment and Coastal Research and River Basin Dynamics and Hydrology Research Group, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, United Kingdom;2. Institute of Geography, Bulgarian Academy of Sciences, “Acad. G. Bonchev”, bl.3, 1113 Sofia, Bulgaria;3. Executive Environmental Agency – Ministry of Environment and Waters, “Tzar Boris III” Boulevard, No. 136, Sofia, Bulgaria
Abstract:Lead isotope signatures (207Pb/206Pb, 208Pb/206Pb, 208Pb/204Pb, 206Pb/204Pb), determined by magnetic sector ICP-MS in river channel sediment, metal ores and mine waste, have been used as geochemical tracers to quantify the delivery and dispersal of sediment-associated metals in the lower Danube River catchment. Due to a diverse geology and range of ore-body ages, Pb isotope signatures in ore-bodies within the lower Danube River catchment show considerable variation, even within individual metallogenic zones. It is also possible to discriminate between the Pb isotopic signatures in mine waste and river sediment within river systems draining individual ore bodies. Lead isotopic data, along with multi-element data; were used to establish the provenance of river sediments and quantify sedimentary contributions to mining-affected tributaries and to the Danube River. Data indicate that mining-affected tributaries in Serbia and Bulgaria contribute up to 30% of the river channel sediment load of the lower Danube River. Quantifying relative sediment contributions from mining-affected tributaries enables spatial patterns in sediment-associated metal and As concentrations to be interpreted in terms of key contaminant sources. Combining geochemical survey data with that regarding the provenance of contaminated sediments can therefore be used to identify foci for remediation and environmental management strategies.
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